1. physically or mentally prepare for something
brace yourself for rejection/impact
The phrasal verb to 'brace for' means to prepare yourself for a negative impact or physical knock or hit. When you 'brace yourself' you put yourself in a position where you are better able to absorb or limit the negative impact of a physical or mental shock. To 'brace for' something is to prepare mentally or physically for something negative that is unavoidable.